JPH0697101B2 - Heating system - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device that heats a refrigerant and performs heating operation by a non-powered heat transfer system.

2. Description of the Related Art In a conventional heating device of this type, as shown in FIG. 3, a gas-liquid separator 3 is arranged at an intermediate position of a liquid receiver 2 located above a refrigerant heater 1 and the liquid receiver 2 is provided. An on-off valve 4 for equalizing the pressure of the two is provided between the gas-liquid separator 3, and a check valve 5 is further provided between the liquid receiver 2 and the gas-liquid separator 3, so that the refrigerant evaporated in the refrigerant heater 1 The heat is condensed by the radiator 6 and flows into the liquid receiver 2. Receiver 2
When the liquid refrigerant accumulates, the on-off valve 4 is opened to equalize the pressure between the liquid receiver 2 and the gas-liquid separator 3 and allow the liquid refrigerant in the liquid receiver 2 to flow into the gas-liquid separator 3. When the inflow is completed, the on-off valve 4 is closed and the check valve 5 is also closed, so that the liquid refrigerant condensed from the radiator 6 again flows into the liquid receiver 2. The above-described operation is repeated to perform heat transfer to perform heating operation (for example, Japanese Utility Model Laid-Open No. 61-43679). Problems to be Solved by the Invention However, in the above conventional configuration, the refrigerant heater is used. The refrigerant circulation amount G required for the heating amount is expressed by the following equation.

G = V × γ / TG: Refrigerant circulation amount required for heating amount (g / sec) V: Liquid receiver volume (cc) γ: Liquid refrigerant density in receiver (g / cc) T: Open / close valve cycle (Opening time + Closing time) (sec) As is clear from this equation, even if the on-off valve cycle is the same, the heating cycle pressure will differ depending on how the opening time and closing time are set. There is a problem that the pressure rises abnormally, the heating operation range is narrowed as a result, and the radiator becomes large in order to prevent it.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and an object of the present invention is to prevent an abnormal increase in the pressure of the heating cycle and to expand the heating operation range without increasing the size of the radiator.

Means for Solving the Problems In order to achieve the above object, the heating device of the present invention is arranged such that a refrigerant heater is disposed below a gas-liquid separator, and the refrigerant heater and the gas-liquid separator are the refrigerant heater. The inlet pipe and the refrigerant heater outlet pipe are connected to form a loop, while the liquid receiver is disposed above the gas-liquid separator and the radiator, the first check valve, the liquid receiver, and the second reverse A stop valve and a gas-liquid separator are connected, and a pressure equalizing pipe having an opening / closing valve is provided between the liquid receiver and the refrigerant heater outlet pipe, and the opening time of the opening / closing operation cycle is set shorter than the closing time. It is equipped with a control device.

Action The present invention has the above-described configuration, and the receiver decompression characteristic during the on-off valve closing time of FIG. 2 (the liquid refrigerant temperature from the radiator, that is, the liquid refrigerant temperature at the receiver inlet side is low and the refrigerant heater evaporation temperature is Indicates that the higher the pressure is, the larger the decompression amount in the receiver is). If the opening time is now longer than the closing time (shown as A mode in Fig. 2), the heat is released from the gas-liquid separator during the opening time to the closing time. Because the amount of refrigerant flowing out to the receiver must be stored in the receiver, the receiver pressure reduction amount during the closing time must be large, and in actual heating operation the liquid refrigerant temperature will not drop below room temperature. Therefore, when the opening temperature of the on-off valve is shorter than the closing time (shown in B mode in Fig. 2) while the evaporation temperature rises and the cycle pressure rises, the closing time is long and the decompression amount of the receiver during the closing time is large. Is smaller than A mode, and evaporation temperature (cycle pressure) is low. Acts like.

Embodiment One embodiment of the present invention will be described below with reference to FIG.
The same members as those in FIG. 2 are designated by the same reference numerals.

In FIG. 1, 1 is a refrigerant heater, which is a gas-liquid separator 3
It is arranged below. The gas-liquid separator 3, the refrigerant heater inlet pipe 7 and the refrigerant heater outlet pipe 8 are connected in a loop. A liquid receiver 2 is provided above the gas-liquid separator 3 and is connected to the gas-liquid separator 3 via a second check valve 5. Reference numeral 6 is a radiator, and 9 is a first check valve. Then, the natural circulation circuit constituted by the refrigerant heater 1, the refrigerant heater outlet pipe 8, the gas-liquid separator 3, and the refrigerant heater inlet pipe 7, the gas-liquid separator 3, the radiator 6, and the first check valve. Valve 9, receiver 2
And a second check valve 5 and a refrigerant circulation circuit.

Further, a pressure equalizing pipe 10 having an opening / closing valve 4 is arranged between the liquid receiver 2 and the refrigerant heater outlet pipe 8. Further, 11 is a control device for controlling the opening / closing time of the opening / closing valve.

In the above configuration, the refrigerant heated by the refrigerant heater 1 flows into the gas-liquid separator 3 through the refrigerant heater outlet pipe 8 in a two-phase state, and the liquid refrigerant again passes through the refrigerant heater inlet pipe 7 to heat the refrigerant. Flows into vessel 1. On the other hand, the gas refrigerant of the two-phase refrigerant flowing into the gas-liquid separator 3 from the refrigerant heater 1 is condensed and liquefied by the radiator 6. At this time, when the on-off valve 4 is closed, the second check valve is closed, and the condensed liquid refrigerant from the radiator 6 is pumped to the liquid receiver 2 through the first check valve 9 and a small amount of liquid refrigerant flows into the receiver 2. The pressure in the liquid container 2 is reduced and the radiator 6 is filled with the condensate. Next, when the opening / closing valve 4 is opened, the liquid receiver 2 and the gas-liquid separator 3 are in a pressure equalizing state, and the liquid refrigerant in the liquid receiver 2 flows into the gas-liquid separator 3 through the second check valve 5. To do. At this time, the first check valve 9 is closed. Next, when the opening / closing valve 4 is closed, the second check valve 5 is closed, the condensed liquid refrigerant flows into the liquid receiver 2 from the radiator 6 again, and then the opening / closing valve 4 is opened. That is, a natural circulation cycle, a gas-liquid separator 3, a radiator 6, a first check valve 9, a liquid receiver 2 and a second check valve 5 are provided between the gas-liquid separator 3 and the refrigerant heater 1. The refrigerant circulation circuit used is the receiver 2
This is an intermittent operation cycle in which the liquid refrigerant flowing from the radiator 6 is collected and is intermittently supplied to the gas-liquid separator 3. Here, since the opening time of the on-off valve 4 is set shorter than the closing time by the control device 11, the amount of the refrigerant flowing out from the gas-liquid separator 3 to the radiator 6 during the opening time is returned to the liquid receiver 3 during the closing time. At this time, the amount of decompression in the liquid receiver 3 may be small and the radiator outlet liquid refrigerant subcooling degree with respect to the condensation temperature of the radiator 6 may be small, so that the pressure rise in the heating cycle can be prevented and the size of the radiator can be increased. Therefore, the heating operation range can be expanded.

As described above, according to the heating device of the present invention, since the opening time of the on-off valve is set shorter than the closing time, it is possible to reduce the radiator outlet liquid refrigerant supercooling degree with respect to the radiator condensation temperature. Yes (by reducing the decompression amount of the receiver and returning the necessary liquid refrigerant to the receiver by increasing the closing time) It is possible to prevent pressure increase in the heating cycle and to heat without increasing the size of the radiator. The operating range can be expanded. Furthermore, since the amount of decompression in the receiver can be reduced, it is also effective in preventing the flow noise of the condensed refrigerant flowing into the receiver when the on-off valve is closed.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of a heating device according to an embodiment of the present invention, FIG. 2 is a characteristic diagram of change in liquid receiver pressure reduction amount, and FIG. 3 is a circuit configuration diagram of a conventional heating device. 1 ... Refrigerant heater, 2 ... Liquid receiver, 3 ... Gas-liquid separator,
4 ... on-off valve, 5 ... second check valve, 6 ... radiator, 9 ...
… First check valve, 11 …… Control device.

Front page continuation (72) Inventor Junichi Jundo, Kadoma City, Osaka Prefecture 1006 Kadoma, Matsushita Electric Industrial Co., Ltd. (72) Koichiro Yamaguchi, Kadoma City, Osaka Prefecture 1006 Kadoma, Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A refrigerant heater is disposed below a gas-liquid separator, and the refrigerant heater and the gas-liquid separator are communicated with each other by a refrigerant heater inlet pipe and a refrigerant heater outlet pipe. The liquid container is disposed above the gas-liquid separator, and the radiator, the first check valve,
The liquid receiver, the second check valve, and the gas-liquid separator are connected in a loop, and a pressure equalizing pipe having an opening / closing valve is provided between the liquid receiver and the refrigerant heater outlet pipe. A heating system consisting of a control unit that sets the opening time of the valve shorter than the closing time.